Reuters reports that a Japanese family plans to sue Japan's Pharmaceutical and Medical Device Agency based on their teenage son's death after taking Tamiflu. The family alleges that the son's abnormal behavior - dashing out of his home barefoot and being run over by a truck - was caused by the drug. The agency, however, previously determined that the boy's death was not caused by Tamiflu, but has stated it will investigate "whether there was a causal link between the drug and psychiatric problems."